On Wed, Sep 2, 2020 at 10:31 AM 'simon place' via golang-nuts
<golang-nuts@googlegroups.com> wrote:
>
> my understanding is the whole wrap mechanism is to move to types, rather than
> strings, so you can test for a 'class' of error without the hacky use of
> string comparison.
You do that using errors.Is and errors.As that use the Unwrap method
to descend the error chain. Error() simply returns a string
representation of the error.
>
> On Wednesday, 2 September 2020 17:18:10 UTC+1, burak serdar wrote:
>>
>> On Wed, Sep 2, 2020 at 10:05 AM 'simon place' via golang-nuts
>> <golan...@googlegroups.com> wrote:
>> >
>> > the example compares the print output of a fmt.errorf wrapped error and a
>> > custom-error type wrapped error, the custom one isn't showing the wrapped
>> > error.,
>>
>> It will if you also print the wrapped error:
>>
>> func (e MyErr) Error() string {
>> return "My wrapping:"+ e.error.Error()
>> }
>>
>>
>>
>> >
>> > On Wednesday, 2 September 2020 16:58:31 UTC+1, burak serdar wrote:
>> >>
>> >> On Wed, Sep 2, 2020 at 9:48 AM 'simon place' via golang-nuts
>> >> <golan...@googlegroups.com> wrote:
>> >> >
>> >> > import "github.com/pkg/errors"
>> >> >
>> >> > should be
>> >> >
>> >> > import "errors"
>> >> >
>> >> > left over from testing, but makes no difference, as expected.
>> >>
>> >> What were you expecting?
>> >>
>> >> >
>> >> > --
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>> >
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>
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